Kindly guide

Since it's trivial:

    for my $fieldnum (0 .. $#fields) {
        if ( exists $hash{ $fields[$fieldnum] } ) {
            print $fh "$row\n";
            next;
        }
    }

[download]

Untested, since the original code provided is not an SSCCE.

Update: Note that vighneshmufc has altered the parent post to change the spec. This and the rest of the subthread may make less sense than originally.

In reply to Re: Comparision Utility PERL by hippo
in thread Comparision Utility PERL by vighneshmufc

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